mx02.aics.ad.jp has no CNAME records.
Question and response
Question
dig mx02.aics.ad.jp. NS
Answer
The response has no answer records.
Authority
aics.ad.jp. 1544 SOA ns0.aics.ad.jp. hostmaster.aics.ad.jp. 2026022401 10800 3600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0